Thunk / Clunk on moderate deceleration from rear (diff)??
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Joined: Jun 2009
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2007 ML350
Thunk / Clunk on moderate deceleration from rear (diff)??
Still getting my car sorted
2002 C230K Coup a/t
90k on the vehicle
New front thrust arms, had a wicked boom on moderate to heavy braking in the front. All fixed.
Current issue - on moderate to heavy deceleration (braking) to a stop, I *sometimes* (say 25% of the time) get a boom/clunk/thump, single sound, from what feels like the differential.
I thought the diff might be leaking, I have since cleaned the housing and will be inspecting when I get a chance, but my question is, what else can I do/check?
It seems/feels like when it is probably shifting from 2nd to 1st, but I am very much feeling it from the rear of the vehicle.
The car does have a Valeo radiator, but I recently (2k) had the trans fluid drained and filled. Of course the jerks didn't save me a fluid sample as per my request... but I read the big test was a SLOW 1st second shift. No clunking/thumping/problems with shifting at all.
Help/Questions welcome.
2002 C230K Coup a/t
90k on the vehicle
New front thrust arms, had a wicked boom on moderate to heavy braking in the front. All fixed.
Current issue - on moderate to heavy deceleration (braking) to a stop, I *sometimes* (say 25% of the time) get a boom/clunk/thump, single sound, from what feels like the differential.
I thought the diff might be leaking, I have since cleaned the housing and will be inspecting when I get a chance, but my question is, what else can I do/check?
It seems/feels like when it is probably shifting from 2nd to 1st, but I am very much feeling it from the rear of the vehicle.
The car does have a Valeo radiator, but I recently (2k) had the trans fluid drained and filled. Of course the jerks didn't save me a fluid sample as per my request... but I read the big test was a SLOW 1st second shift. No clunking/thumping/problems with shifting at all.
Help/Questions welcome.
Super Moderator
Joined: Jun 2008
Posts: 19,942
Likes: 192
From: Llandudno, Cape Town, South Africa
late 2009 CLK 350 Coupe Elegance, '65 Jaguar S Type wires
Well it could be the diff. First think to check is the propshaft flex discs (265/270) & rear gearbox mounting. Then centre bearing & UJ.
Super Moderator
Joined: Jun 2008
Posts: 19,942
Likes: 192
From: Llandudno, Cape Town, South Africa
late 2009 CLK 350 Coupe Elegance, '65 Jaguar S Type wires
Look for play & cracks in flex discs - play in everything else. Be safe. Proper jackstands or ramps.
Also place car in neutral and try & rotate propshaft by hand & see if you can detect excessive lash in the diff.
Also place car in neutral and try & rotate propshaft by hand & see if you can detect excessive lash in the diff.
